Enhancing efficiency of dye-sensitized solar cells by combining use of TiO2 nanotubes and nanoparticles |
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Authors: | XD Li DW Zhang S Chen ZA Wang Z Sun XJ Yin SM Huang |
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Affiliation: | 1. Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, East China Normal University, North Zhongshan Rd. 3663, Shanghai 200062, PR China;2. Advanced Materials Technology Centre, Office of the Chief Technology Officer, Singapore Polytechnic, 500 Dover Rd., Singapore 139651, Singapore |
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Abstract: | Titanium dioxide nanotubes (TiNTs) were fabricated from commercial P25 TiO2 powders via alkali hydrothermal transformation. Dye-sensitized solar cells (DSCs) were constructed by application of TiNTs and P25 nanoparticles with various weight percentages. The influence of the TiNT concentration on the performance of DSCs was investigated systematically. The electrochemical impedance spectroscopy (EIS) technique was employed to quantify the recombination resistance, electron lifetime and time constant in DSCs both under illumination and in the dark. The DSC based on TiNT/P25 hybrids showed a better photovoltaic performance than the cell purely made of TiO2 nanoparticles. The open-voltage (Voc), fill factor (FF) and efficiency (η) continuously increased with the TiO2 nanotube concentration from 0 to 50 wt%, which was correlated with the suppression of the electron recombination as found out from EIS studies. Respectable photovoltaic performance of ca. 7.41% under the light intensity of 100 mW cm−2 (AM 1.5G) was achieved for DSCs using 90 wt% TiO2 nanotubes incorporated in TiO2 electrodes. |
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Keywords: | Titanium dioxide nanotubes Internal resistances Electron lifetime Dye-sensitized solar cells |
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